SCORING SQUARE: This drywall square has a board guide and a hand grip to guarantee your work progresses smoothly and efficiently. While the perforation on its 24" blade enables rapid and efficient scoring ALUMINUM BODY: No worksite is too difficult for this measurement tool. Its blade features extruded aluminum construction that ensures long lifespan; and its molded high impact Structo-Cast head withstands the harshest worksite conditions SCREENED GRADUATIONS: Even in low-light settings the RockRipper's thermal-bonded screened black 1/8" and 1/16" graduations are easy to read. APPLICATIONS: The RockRipper drywall square performs exceptionally well in drywall hanging. Its perforated blade makes scoring drywall tasks much easier PRODUCT FEATURES: This 24’’ square has a permanent 90° molded Structo-Cast head; scribing/scoring notches for knife or pencil; and 1/16’’ scribe/score increments